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The plots presented on these pages display the stationary point source emissions within and near the analysis areas around each Class I Areas. Arc/INFO GIS software was used with Arc Macro Language (AML) scripts to automate the processing and display generation. Each map also includes the Class I Area or Areas, including the 50km analysis area, and relevant land use types, including urban areas and water bodies. Transportation networks are plotting to display the locations of primary and secondary roadways, railroads, airport and ports. County and state boundaries, analysis areas, and all Class I Areas within the region are also displayed on the maps. The geographic extent of each map was set as a rectangular region 350 km across, centered on the Class I Area group. Stationary point sources within this region were then displayed as "bubble plots" indicating the location and relative magnitude of the emission sources.
Point source emissions are displayed as "bubble plots" indicating the relative emission rate of each source and labeled uniquely with a numeric identification code.
In order to reduce the number of "bubbles" and to avoid a "bulls-eye" effect when multiple stacks are present in the point source emission database at the same geographic coordinates, the data are first aggregated by plant, or facility. In addition, due to the relatively large number of stationary point sources, and due to various limitations with the Arc/INFO plotting capabilities, the facility-level point source emissions are further aggregated to 36-km grid cells. Thus, each "bubble" represents the total point source emissions within a 36-km grid cell and each label corresponds to multiple sources and/or facilities. Corresponding tables are then generated such that the source names, type, location and emission rate of each pollutant shown on the map can be looked up based on the source identification code displayed on the map.
Each entry in the table represents the facility or plant-level emissions cross-referenced with the numeric ID displayed on the map. In cases where there is only a single facility within each 36-km grid cell, the "bubbles" are displayed in a different color to distinguish these from grid cell aggregated emissions, and the maps are annotated appropriately.
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